<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8" />
  <title>localStorage</title>
</head>
<body>
<h2>localStorage</h2>
<button onclick="saveData()">点我保存一个数据</button>
<button onclick="readData()">点我读取一个数据</button>
<button onclick="deleteData()">点我删除一个数据</button>
<button onclick="deleteAllData()">点我清空一个数据</button>

<script type="text/javascript" >
  let p = {name:'张三',age:18}

  function saveData(){
    localStorage.setItem('msg','hello!!!')
    localStorage.setItem('msg2',666)
    localStorage.setItem('person',JSON.stringify(p))
  }
  function readData(){
    console.log(localStorage.getItem('msg'))
    console.log(localStorage.getItem('msg2'))

    const result = localStorage.getItem('person')
    console.log(JSON.parse(result))

    // console.log(localStorage.getItem('msg3'))
  }
  function deleteData(){
    localStorage.removeItem('msg2')
  }
  function deleteAllData(){
    localStorage.clear()
  }
</script>
</body>
</html>
